8189538509 has 2 divisors, whose sum is σ = 8189538510. Its totient is φ = 8189538508.

The previous prime is 8189538463. The next prime is 8189538521. The reversal of 8189538509 is 9058359818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7198674025 + 990864484 = 84845^2 + 31478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8189538509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8189538589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4094769254 + 4094769255.

It is an arithmetic number, because the mean of its divisors is an integer number (4094769255).

Almost surely, 2^8189538509 is an apocalyptic number.

It is an amenable number.

8189538509 is a deficient number, since it is larger than the sum of its proper divisors (1).

8189538509 is an equidigital number, since it uses as much as digits as its factorization.

8189538509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3110400, while the sum is 56.

The square root of 8189538509 is about 90496.0690251240. The cubic root of 8189538509 is about 2015.6717530742.

The spelling of 8189538509 in words is "eight billion, one hundred eighty-nine million, five hundred thirty-eight thousand, five hundred nine".